- A
Transition the objects to S3 Glacier Instant Retrieval after 30 days.
Glacier Instant Retrieval is designed for data that is rarely accessed but still needs millisecond retrieval. Because the logs remain in the archive for 11 more months, the 90-day minimum storage duration is not a problem, and the storage cost is lower than keeping them in a hotter class.
- B
Expire the objects after 365 days.
Lifecycle expiration enforces the one-year retention requirement automatically and prevents paying for storage beyond the compliance window. It also removes the operational risk of manual deletion.
- C
Transition the objects to S3 Standard-IA after 30 days.
Why wrong: Standard-IA is a valid infrequent-access class, but it is typically more expensive than Glacier Instant Retrieval for data that is rarely read. Since the question explicitly asks for the most cost-optimized choice while preserving immediate retrieval, this is not the best answer.
- D
Keep the logs in S3 Standard indefinitely and delete them manually when needed.
Why wrong: S3 Standard is unnecessary for data that becomes rarely accessed after 30 days, so it wastes storage cost over the remaining retention period. Manual deletion also weakens compliance controls and increases operational overhead.
- E
Replicate the logs to another Region for cheaper archival storage.
Why wrong: Cross-Region replication adds storage and inter-Region data transfer cost. It does not reduce the cost of the retention policy described in the scenario and is not needed to meet the archive requirement.
Quick Answer
The answer is to transition objects to S3 Glacier Instant Retrieval after 30 days and expire them after 365 days. This combination works because Glacier Instant Retrieval is the only archive storage class that maintains millisecond retrieval times, satisfying the compliance requirement that logs, though almost never accessed after day 30, must be instantly available if needed. On the SAA-C03 exam, this scenario tests your ability to distinguish between Glacier storage tiers: Deep Archive offers the lowest cost but has retrieval times in hours, while Glacier Flexible Retrieval takes minutes, making Instant Retrieval the correct choice for millisecond access. A common trap is selecting Glacier Deep Archive for cost savings, forgetting the retrieval speed constraint. Memory tip: “Instant” means milliseconds—if the question demands immediate access, always pair it with the Instant tier, not the cheaper but slower alternatives.
SAA-C03 Design Cost-Optimized Architectures Practice Question
This SAA-C03 practice question tests your understanding of design cost-optimized architectures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A compliance archive writes one log file per day to Amazon S3. The logs are almost never accessed after day 30, but if they are needed they must still be retrievable in milliseconds. They must be deleted automatically after one year. Which two lifecycle settings should you apply? Select two.
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"never"Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Transition the objects to S3 Glacier Instant Retrieval after 30 days.
Option A is correct because S3 Glacier Instant Retrieval provides millisecond retrieval times for archived data, meeting the requirement that logs must be retrievable in milliseconds after 30 days. This storage class is designed for long-lived, rarely accessed data that still needs immediate access, making it ideal for compliance archives that are almost never accessed but must be available instantly when needed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Transition the objects to S3 Glacier Instant Retrieval after 30 days.
Why this is correct
Glacier Instant Retrieval is designed for data that is rarely accessed but still needs millisecond retrieval. Because the logs remain in the archive for 11 more months, the 90-day minimum storage duration is not a problem, and the storage cost is lower than keeping them in a hotter class.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Expire the objects after 365 days.
Why this is correct
Lifecycle expiration enforces the one-year retention requirement automatically and prevents paying for storage beyond the compliance window. It also removes the operational risk of manual deletion.
Clue confirmation
The clue word "never" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Transition the objects to S3 Standard-IA after 30 days.
Why it's wrong here
Standard-IA is a valid infrequent-access class, but it is typically more expensive than Glacier Instant Retrieval for data that is rarely read. Since the question explicitly asks for the most cost-optimized choice while preserving immediate retrieval, this is not the best answer.
- ✗
Keep the logs in S3 Standard indefinitely and delete them manually when needed.
Why it's wrong here
S3 Standard is unnecessary for data that becomes rarely accessed after 30 days, so it wastes storage cost over the remaining retention period. Manual deletion also weakens compliance controls and increases operational overhead.
- ✗
Replicate the logs to another Region for cheaper archival storage.
Why it's wrong here
Cross-Region replication adds storage and inter-Region data transfer cost. It does not reduce the cost of the retention policy described in the scenario and is not needed to meet the archive requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse S3 Standard-IA with S3 Glacier Instant Retrieval, assuming Standard-IA is the cheapest option for infrequent access, but they overlook that Glacier Instant Retrieval offers lower storage costs for data that is almost never accessed while still providing millisecond retrieval, and they may forget that lifecycle expiration must be explicitly set for automatic deletion.
Trap categories for this question
Scenario analysis trap
Cross-Region replication adds storage and inter-Region data transfer cost. It does not reduce the cost of the retention policy described in the scenario and is not needed to meet the archive requirement.
Detailed technical explanation
How to think about this question
S3 Glacier Instant Retrieval is optimized for data that is accessed less than once per quarter but requires retrieval in milliseconds, with a minimum storage duration of 90 days. The lifecycle policy transitions objects from S3 Standard to S3 Glacier Instant Retrieval after 30 days, and the expiration action deletes objects after 365 days, ensuring compliance with the one-year retention requirement. Under the hood, S3 lifecycle policies are evaluated daily, and transitions are subject to the 30-day minimum for S3 Standard-IA and 90-day minimum for S3 Glacier Instant Retrieval, so the 30-day transition to Glacier Instant Retrieval is valid only if the objects have been in S3 Standard for at least 30 days.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
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FAQ
Questions learners often ask
What does this SAA-C03 question test?
Design Cost-Optimized Architectures — This question tests Design Cost-Optimized Architectures — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Transition the objects to S3 Glacier Instant Retrieval after 30 days. — Option A is correct because S3 Glacier Instant Retrieval provides millisecond retrieval times for archived data, meeting the requirement that logs must be retrievable in milliseconds after 30 days. This storage class is designed for long-lived, rarely accessed data that still needs immediate access, making it ideal for compliance archives that are almost never accessed but must be available instantly when needed.
What should I do if I get this SAA-C03 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "never". Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Same concept, more angles
1 more ways this is tested on SAA-C03
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A media company keeps application logs in Amazon S3 for 400 days. The logs are read heavily for the first 30 days, occasionally for the next 90 days, and almost never after that. The team wants to lower storage cost without affecting retention requirements. Which two lifecycle transitions should it configure? Select two.
medium- ✓ A.Transition the objects to S3 Standard-IA after 30 days.
- ✓ B.Transition the objects to S3 Glacier Deep Archive after 120 days.
- C.Transition the objects to S3 One Zone-IA after 30 days.
- D.Keep the objects in S3 Standard for the full 400 days.
- E.Use only S3 Intelligent-Tiering and never add archival transitions.
Why A: Option A is correct because after the first 30 days of heavy read access, transitioning to S3 Standard-IA reduces storage costs while still providing low-latency retrieval for the occasional reads that occur over the next 90 days. S3 Standard-IA is designed for data accessed infrequently but requires rapid access, matching the usage pattern described.
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Last reviewed: Jun 11, 2026
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